Smooth Steel Sheet
https://gyazo.com/36a69ec3383b025d7bbac8e118559d29
鋭い角度があっても落ちにくい
After extended use (1-2 years) the surface can smooth out further, which affects adhesion. Using high-grit sandpaper (600-1000), the PEI can be revived by light sanding, bring fresh PEI to the surface.
The sheet will have a very light texture after this treatment.